Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bd910f9ab3f826…

MALICIOUS

PDF

80.1 KB Created: 2021-03-31 18:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86f9ee0dc0e53097559a9021a85a4d3e SHA-1: d232d0b760761f4a0852d22eb676bc3b6ac55a74 SHA-256: 69bd910f9ab3f8260e5c541b071640fe2d5187c59827023b8398257942440e04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a link farm, designed to redirect users to other malicious PDF files. The heuristic firings and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to distribute further malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/award?keyword=english+story+book+pdf+free+download
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/9057941.pdf
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/dc38b98a.pdf
    • https://cdn.sqhk.co/nodujugebi/jbmhjV5/noticias_alfa_romeo_f1.pdf
    • http://jivavesomuviz.getenjoyment.net/compuestos_alcanos.pdf
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/2ef307939513.pdf
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/5478984.pdf
    • https://cdn.sqhk.co/seranowe/k43xhcJ/xexobujevolasag.pdf
    • http://serururepus.scienceontheweb.net/guvojizag.pdf
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/zibipavegufanetimaga.pdf
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/7858aa09d57f9.pdf
    • http://kakafeg.scienceontheweb.net/2006_toyota_sienna_radiator_replacement_cost.pdf
    • https://motadonikedubi.weebly.com/uploads/1/3/1/8/131856170/88ee5c223b.pdf
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/107d53747384e0.pdf
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/495393.pdf
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/waxuxafubun.pdf
    • http://nitapida.mywebcommunity.org/social_psychology_10th_edition_aronson_free_download.pdf
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/7976938.pdf
    • https://cdn.sqhk.co/gulijolane/gghmcie/ninjas_infinity_2_hack.pdf
    • http://novofikupeneda.mywebcommunity.org/water_bioremediation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://luxupovokajaf.onlinewebshop.net/elementary_statistical_methods_in_psychology_and_education.pdf
    • http://xirexadugimog.atwebpages.com/what_are_the_problems_of_being_very_rich_and_wealthy.pdf
    • http://kimoviranonaf.onlinewebshop.net/68140232259.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed77.bin
e507c912e3f922085d79705678fa84d95e686553f803c47a766812dd1062b3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 5444 bytes
font_01_sfnt_off00010003.bin
26ef51406c13139198a5d5b0acc2bb877407ea8c87aadb557534533100ddd862
pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 10212 bytes
font_02_sfnt_off000122dd.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 4324 bytes